Cwmllynfell narrowly defeated Kenfig Hill 26-24, who secured a bonus point after going over four times, to cement their place in second. Third-placed Waunarlwydd earned a hard-fought 24-19 win at home to strugglers Skewen, while Carmarthen Athletic hammered hosts Aberavon Quins 69-3 after scoring 11 tries.
In perhaps the most surprising result of all the Division One fixtures this weekend, Ammanford beat their mid-table rivals Langennech 46-3 and secured a bonus point in the process.
Elsewhere, in Division Two, Seven Sisters have moved within a point of table-toppers Builth Wells after securing a 43-18 thrashing at home to Maesteg Quins.
Crymych also eased past eighth-placed Felinfoel in a 51-20 win while Maesteg earned a bonus point win at home to Aberystwyth. Penclawdd put 50 points past Haverfordwest and secured a bonus point win leaving the struggling Pembrokeshire outfit nine points adrift at the bottom of the table.
In Division Three, Amman United stay 10 points clear at the top despite failing to secure a bonus point against hosts Pontarddulais with the match finishing 20-3 to the visitors.
In Division Four, unbeaten Tycroes scored eight tries against Betws to earn a convincing 53-0 win to keep their promotion ambitions right on track.
